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Messages - renojim

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Toyota! (and Lexus and Scion) / Re: 2003 Matrix won\'t idle down
« on: February 15, 2011, 11:26:15 PM »
Just for closure, it was the throttle body.  While I doubt many, if any, others will have the same problem, the problem was the throttle plate getting stuck on the throttle body.  As it opened it moved slightly off center, then when it closed it rubbed against the throttle body, wearing a small indentation into the throttle body, and got stuck.  For some reason, it only happened while driving.  I could move it back and forth by hand and it would never happen.  I fixed it by adding a spacer (a thin washer I pounded out of a loop of wire) around one end of the throttle plate shaft.  It keeps the throttle plate from moving off center.  Hopefully it won\'t fall off.

fishexpo101, thanks for all the help!

-JT

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Toyota! (and Lexus and Scion) / Re: 2003 Matrix won\'t idle down
« on: February 11, 2011, 02:15:48 AM »
Thanks for all the help!  At this point I\'m tempted to say it is the throttle body.  It appears that there is a worn spot that the throttle plate is getting hung up on that prevents it from closing the whole way.  I\'m thinking if the return spring was stronger it would force the throttle plate past that point, but I don\'t know if such a thing exists.  Seems a shame to replace the whole throttle body for something so simple.

-JT

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Toyota! (and Lexus and Scion) / Re: 2003 Matrix won\'t idle down
« on: February 05, 2011, 02:13:17 AM »
Thanks for the suggestions.  I had checked the cables for binding earlier and they look ok.  I thought I found the problem when I took the hose off from the throttle body to the air cleaner box and saw that the vacuum hose to the air cleaner box was disconnected.  It probably happened when she took the car to Walmart for an oil change and they changed her air filter.  Reconnecting it didn\'t make a difference.  I gave the throttle body and idle control a good cleaning, but it didn\'t make much of a difference.  It looks like the throttle plate may not be closing the whole way, but it\'s very close.  It might stop about a millimeter or two before it hits the idle stop screw.  Forcing it the rest of the way does get the idle to go down.  The only way I could clean it any better is to take apart the throttle plate mechanism and I\'m a little afraid that either the return spring will go flying or be impossible to get back on.  Throttle bodies don\'t go bad, do they?  I\'ll give taking the mechanism apart a try if you think it\'s worthwhile.

I suppose the ISC valve could have a problem, but I\'m not sure how I\'d figure it out without trying a new one.

Thanks for your help,
-JT

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Toyota! (and Lexus and Scion) / 2003 Matrix won\'t idle down
« on: February 04, 2011, 10:31:47 AM »
Hi all!  I\'m trying to help out a friend of mine.  She has a 2003 Matrix with the 2zz engine and it won\'t idle down, even after it\'s warmed up.  When you come to a stop and push in the clutch the engine races to 4000+ RPM (seems to be getting worse; it used to be around 3000).  If you mash on the accelerator it will idle down to around 1000, which I assume is normal.  I have it for the weekend and told her I\'d take a look at it.  Any thoughts as to what I should look for?

Thanks,
-JT

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